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The SPWL0000000309 Release Bearing is a precision-engineered clutch release bearing designed for smooth and reliable clutch disengagement in SINOTRUK Sitrak heavy-duty manual transmissions. This OEM-grade bearing ensures consistent pedal feel, reduces wear on the clutch diaphragm spring, and provides long service life under demanding stop-and-go and highway conditions. As a critical element among Sinotruk Sitrak parts, the SPWL0000000309 is manufactured to exacting tolerances with high-quality bearing steel and advanced lubrication, ensuring minimal friction and heat generation. Its robust construction and sealed design protect against contamination, making it a reliable choice for fleet operators and workshops seeking genuine replacement components for their Sitrak trucks.
Release Bearing
Выжимной подшипник
Rodamiento de Embrague
The SPWL0000000309 is a self-aligning, ball-type release bearing that operates between the clutch fork and the diaphragm spring fingers. When the clutch pedal is depressed, this bearing translates the force from the hydraulic or mechanical linkage into axial movement, disengaging the clutch disc from the flywheel. Its design incorporates a durable outer housing, a precision-ground inner race, and a sealed grease fill that eliminates the need for periodic lubrication.
Manufactured from high-carbon chromium steel with a hardened and ground raceway, the SPWL0000000309 offers excellent resistance to wear, pitting, and thermal degradation. The bearing’s integrated dust shield and contact seals keep out clutch dust, dirt, and moisture, significantly extending its service life. Choosing the genuine SPWL0000000309 ensures smooth clutch operation, reduced pedal effort, and improved driver comfort.
Self-Aligning Design: The SPWL0000000309 features a spherical outer ring that automatically compensates for minor misalignment between the clutch fork and diaphragm spring, ensuring even contact and reducing uneven wear.
Integral Sealing & Grease Retention: The bearing is pre-greased with high-temperature lithium complex grease and sealed with dual-lip nitrile seals, preventing leakage and ingress of abrasive clutch dust.
Premium Bearing Steel: The inner and outer rings are made from vacuum-degassed bearing steel (SAE 52100), hardened to 60–64 HRC, offering exceptional fatigue strength and resistance to brinelling.
Wide Operating Temperature Range: Designed to function reliably from -40°C to +150°C, the bearing withstands the heat generated by high-friction clutch applications and extreme weather conditions.
Additionally, the SPWL0000000309 incorporates a nylon ball retainer that reduces rotational noise and provides smooth, low-friction operation. Its compact dimensions and standardized fitment make it a direct replacement for the original equipment, simplifying workshop inventory and installation.
The following table provides all critical dimensions and performance data for the SPWL0000000309. These specifications are verified against SINOTRUK original equipment standards.
All dimensions and load ratings conform to DIN 620 and ISO 15 standards. Always verify the release bearing fitment with your clutch assembly and gearbox specifications.
The SPWL0000000309 is extensively used in SINOTRUK Sitrak trucks equipped with manual or automated manual transmissions (AMT). It is compatible with clutch assemblies that utilize a diaphragm spring and a standard release fork mechanism. Common applications include the ZF 16S and Eaton Fuller style transmissions found in C7H, T7H, and A7 series vehicles.
This bearing also serves as a replacement for many other heavy-duty truck brands that share the same dimensional and load specifications, making the SPWL0000000309 a versatile stock-keeping unit for workshops. Always check the inner and outer diameters and width to confirm fitment.
Installation Guide: Before installation, clean the clutch fork and bearing housing thoroughly. Apply a thin coat of high-temperature grease to the fork contact surfaces. Carefully slide the SPWL0000000309 onto the fork shaft or into the carrier, ensuring it is fully seated and clips into place (if applicable). Do not hammer or press on the outer race directly – use a suitable bearing installer tool to avoid damage.
Maintenance Advice: Since the bearing is sealed and pre-lubricated, no additional greasing is required. However, during clutch replacement, inspect the release bearing for smooth rotation, axial play, and seal integrity. Replace the SPWL0000000309 if you detect roughness, noise, or signs of grease leakage. Always replace the bearing when replacing the clutch disc and pressure plate to ensure optimal performance.
Using a genuine SPWL0000000309 ensures correct internal clearance and self-alignment characteristics, which are vital for proper clutch operation. Avoid reusing old bearings, as they may have worn contact surfaces that can damage the new diaphragm spring.
Opting for the authentic SPWL0000000309 guarantees a release bearing that has been tested for axial load capacity, rotational accuracy, and thermal stability. Unlike generic bearings, this component is engineered to match the exact clutch lever force and stroke of SINOTRUK Sitrak trucks, resulting in consistent pedal feel and reduced driver fatigue.
The SPWL0000000309 is backed by SINOTRUK’s quality assurance, providing peace of mind for fleet operators. Users report smoother gear engagement, reduced clutch chatter, and longer clutch life after switching to genuine release bearings.
The SPWL0000000309 complies with ISO 1224 and DIN 616 standards for release bearings. It is manufactured under IATF 16949 certified processes, ensuring high reliability. The steel meets ASTM A295 specifications for bearing-quality material.
To avoid counterfeits, purchase this bearing from authorized SINOTRUK distributors. Genuine bearings are laser-engraved with the part number and have a distinctive seal color. Using non-certified bearings can lead to premature failure, clutch slippage, and costly transmission damage.
Although the SPWL0000000309 is robust, certain conditions can affect its performance. A worn or noisy release bearing often manifests as a chirping or rattle sound when the clutch pedal is depressed – this indicates internal wear and requires immediate replacement. If the bearing fails to disengage the clutch completely, check for hydraulic system issues or fork misalignment, but also verify that the bearing is correctly seated.
Grease leakage from the bearing indicates seal damage, usually caused by heat or physical debris. Replace the SPWL0000000309 with a new unit and inspect the clutch housing for foreign material. Always use the recommended grease and torque specifications during installation to avoid overloading the bearing.
SINOTRUK is committed to sustainable manufacturing. The SPWL0000000309 is produced using energy-efficient processes, and the steel is sourced from recycled content. Its long service life reduces the frequency of replacements, minimizing waste and resource consumption.
By maintaining a properly functioning release bearing, you reduce clutch drag and improve fuel economy. Used bearings can be recycled at metal scrapyards, supporting the circular economy. Choosing genuine parts also reduces the environmental footprint associated with frequent repairs.
The SPWL0000000309 Release Bearing is a high-quality, reliable component that ensures smooth and consistent clutch operation in SINOTRUK Sitrak trucks. Its self-aligning design, robust construction, and sealed lubrication make it a durable choice for heavy-duty applications.
In this comprehensive guide, we have covered the bearing’s features, specifications, installation best practices, and environmental benefits. With this information, you can confidently select the genuine component that maximizes uptime, reduces maintenance costs, and enhances driver comfort.
Explore our full range of authentic SINOTRUK Sitrak components and keep your fleet operating at peak performance. Choose the SPWL0000000309 – the trusted release bearing solution for professionals worldwide.
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